const char *line_vsh = R"(  // "
/*
 * Copyright (c) 2019 Anton Stiopin astiopin@gmail.com
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

uniform mat3 transform_matrix;

attribute vec2 pos;
attribute vec2 par;
attribute vec2 limits;
attribute float scale;
attribute float line_width;

varying vec2  vpar;
varying vec2  vlimits;
varying float dist_scale;

void main() {
    vpar = par;
    vlimits = limits;
    dist_scale = scale / line_width;
    
    vec2 tpos = ( transform_matrix * vec3( pos, 1.0 ) ).xy;
    gl_Position = vec4( tpos, 0.0, 1.0 );
}

)"; // "
